"Update to Transparent Page Sharing (TPS) management capabilities and new default behavior In ESXi 5.1 Update 3, the pshare salting for the Transparent Page Sharing (TPS) management capabilities that was introduced in the previous patch release is enabled by default. This means that TPS only applies to individual VM’s and that inter-VM TPS is disabled unless an administrator chooses to re-enable it. For more information, see KB 2097593."